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Speaker - 3 Diameter - 4 Ohm 3 Watt : ID 1314 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
2x 2" inch 4Ohm 4Ω 3W Full Range Driver Audio Speaker Stereo Loudspeaker 52x52mm | eBay
2pcs 2" inch 52mm 4ohm 4Ω 3W Full Range Audio Speaker Stereo Woofer Loudspeaker | eBay
Ootdty 2pcs 2" Inch 53mm 4ohm 3w Full Range Audio Speaker Stereo Woofer Loudspeaker New - Speakers - AliExpress
Amazon.com: Cylewet 4Pcs 2inch 4Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino and DIY Speaker (Pack of 4) CYT1120 : Electronics